mass undo last develop step?

[Eruditass]

Is there a way to do a mass undo in lightroom's develop module? Or at least a hotkey to go to the previous history step?

The story, for those interested in face-palming: so I had adjust a setting and went to copy and paste the settings to every image from that day. I thought I had unchecked everything, then clicked on what I had wanted, but somehow crop was selected. Everything was pasted and I closed Lightroom to back it up.

I open it and all of my photos which I had cropped selectively had lost their crop. Ctrl+Z did nothing, as it doesn't remember things from the last session.

[feppe]

I don't know how to batch undo or if it's even possible, but if all else fails, try reverting back to the previous backed up catalog. Depending on how much editing you did between that and current one, and how many pictures you have to manually undo it might be faster. Make sure to back up the current one before trying that.